<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>dropRight</title>
</head>

<body>
    <div>打开浏览器控制台查看结果</div>
    <script>
        const dropRight = (arr, n = 1) => arr.slice(0, -n);
        console.log(dropRight([1, 2, 3])); // [1, 2]
        console.log(dropRight([1, 2, 3], 2)); // [1]
        console.log(dropRight([1, 2, 3], 42)); // []
    </script>
</body>

</html>